Led_on_c

TerryJk

会有3个led灯亮起

 

crt0.S

1. .text
   
2. .global _start
   
3. _start:
   
4.     ldr r0,=0x53000000
   
5.     mov r1,#0x0
   
6.     str r1,[r0]
   
7.     ldr sp,=1024*4
   
8.     bl main
   
9. halt_loop:
   
10.     b halt_loop

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led_on_c.c

1. #define GPBCON (*(volatile unsigned long *)0x56000010)
   
2. #define GPBDAT (*(volatile unsigned long *)0x56000014)
   
3. 
   
4. int main()
   
5. {
   
6.     GPBCON = 0x00005400;
   
7.     GPBDAT = 0x00000000;
   
8. 
   
9.     return 0;
   
10. }

 

Makefile

1. led_on_c.bin:crt0.S led_on_c.c
   
2.     arm-linux-gcc -g -c -o crt0.o crt0.S
   
3.     arm-linux-gcc -g -c -o led_on_c.o led_on_c.c
   
4.     arm-linux-ld -Ttext 0x00000000 -g crt0.o led_on_c.o -o led_on_c_elf
   
5.     arm-linux-objcopy -O binary -S led_on_c_elf led_on_c.bin
   
6.     arm-linux-objdump -D -m arm led_on_c_elf > led_on_c.dis
   
7. clean:
   
8.     rm -rf led_on_c.dis led_on_c.bin led_on_c_elf *.o